Ja, you better have another look of your wording of South Africa. Going through a tough patch but without a doubt a powerhouse of world rugby. Don't forget it ;)

A good understanding of teams may be to look at historical brackets (in my opinion - no offense to any teams in particular):

Top - NZ, AUS, SA, ENG

2nd Tier - FRA, IRE, WAL, SCO, ARG (only recently)

3rd Tier - ITA, JAP, Fiji, Samoa, Tonga

The rest - Namibia, Georgia, USA, Spain etc. etc.

Edit: you guys might not like this but it’s pretty accurate if you look at success at RWCs since 1987. Top tier have all won the tournament. Tier 2 have all been in a semi final (except Ireland). Tier 3 - some have made quarter finals.

For the record, I was not talking about current rankings so don’t get your jockstrap in a knot.